Taking up the persistent phenomena of statelessness across the world, this thesis explores the nexus between stateless Roma and registration practices. The current issue of lack of registration perpetuates statelessness, however, is largely under researched. This fact warrants a thorough examination of registration historically, studying the processes onto which the practice depends today. Using theoretical concepts such as nation-birth link, biopolitics, and inclusive-exclusion this thesis argues when studying the case of stateless Roma, an oscillating pattern of registration is revealed between nonregistration and registration. This is understood as exclusionary and racialised techniques to control, surveil, and regulate the behaviour and movement of the ‘outsider’ – registration is a biopolitical tool of drawing these lines. The study uses an exploratory research design coupled with a genealogy-inspired method which allows us to critically examine and uncover the processes onto which the stateless phenomena depend.